Importance

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Abstract

A double lumen catheter comprising an elongated cylindrical tube enclosing first and second lumens separated by an internal divider, the proximal end of the elongated tube connecting to two separate connecting tubes communicating with the respective first and second lumens for the injection and removal of blood, the first lumen extending from the proximal end of the elongated tube to a first opening formed in the side wall of the tube and at the distal end of the elongated tube, and the second lumen extending from the proximal end of the elongated tube to a second opening spaced a sufficient distance away from the first opening, in the longitudinal direction, to prevent mixing of the returned blood with the blood taken in, the distal end portion of the tube beyond the distal end of the second lumen continuing the cylindrical configuration of the tube to the distal end of the first lumen so as to form a blunt circular end on the tube to prevent the end of the catheter from traumatizing or becoming caught in the walls of a blood vessel into which the catheter is inserted.

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First Claim